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-rw-r--r--arch/x86_64/kernel/apic.c20
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/x86_64/kernel/apic.c b/arch/x86_64/kernel/apic.c
index c02218b3ae2b..6147770b4347 100644
--- a/arch/x86_64/kernel/apic.c
+++ b/arch/x86_64/kernel/apic.c
@@ -72,6 +72,26 @@ int get_maxlvt(void)
return maxlvt;
}
+/*
+ * 'what should we do if we get a hw irq event on an illegal vector'.
+ * each architecture has to answer this themselves.
+ */
+void ack_bad_irq(unsigned int irq)
+{
+ printk("unexpected IRQ trap at vector %02x\n", irq);
+ /*
+ * Currently unexpected vectors happen only on SMP and APIC.
+ * We _must_ ack these because every local APIC has only N
+ * irq slots per priority level, and a 'hanging, unacked' IRQ
+ * holds up an irq slot - in excessive cases (when multiple
+ * unexpected vectors occur) that might lock up the APIC
+ * completely.
+ * But don't ack when the APIC is disabled. -AK
+ */
+ if (!disable_apic)
+ ack_APIC_irq();
+}
+
void clear_local_APIC(void)
{
int maxlvt;